Keystones — Capstone
Five GCSE retrieval questions · 26 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 3
Answer: 2(x - 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 45°. Give your answer to 2 decimal places
Answer: 178.19cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 56:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 76, 93, 68, 35, 86, 95. Give your answer to 2 decimal places
Answer: Mean = 68.86, Median = 76, Range = 66